Certain substituted piperidyl sulfamides



United States Patent This invention is directed to a particular class of sulfamides which have anti-inflammatory properties and to the use of said sulfamides as anti-inflammatories. The subject compounds have the structure RSO R' wherein R is e.g. 3-methylpiperidyl;

each of R R R R R R, R and R is either a hydrogen atom (H) or one of the following functional groups: lower alkyl, e.g., methyl, ethyl, propyl, isopropyl and butyl; aryl of the formula Rm n R12 Ru e.g. phenyl;

ar(lower) alkyl of the formula e.g., benzyl and phenethyl; and cycloalkyl having from 5 to 7 carbonatoms, e.g., cyclopentyl, cyclohexyl and cycloheptyl; with the proviso that there are 'no more than three of said functional groups on any two adjacent carbon atoms, a plurality of cycloalkyl groups are not bound to adjacent carbon atoms; and at most seven of R R R R R R R? and R hydrogen atoms;

each of R and R taken together, R and R taken together, R and R taken together, and R and R taken together alternatively form with the ring carbon atom to which they are bound a saturated carbocyclic ring having from 5 to 7 !carbon atoms, e.g., 2,2-tetramethylene, 3,3-pentamethylene and 4,4-hexamethylene; with the proviso that adjacent carbon atoms do not form polymethylene rings;

each f 9 R10 11 12 13 14 15 R16, 11

R is either a hydrogen atom (-.-H); a chlorineatom (Cl); a fluorine atom (--F); a bromine atom (Br); lower alkyl, e.g., methyl, ethyl, propyl, isopropyl and butyl; lower alkoxy, e.g., methoxy, ethoxy, propoxy, isopropoxy and butoxy; trifluoromethyl (CF or lower alkylthio,:e.g., methylthio, ethylthio, propylthio, isopropylthio and butylthio;

each of R and taken together, R and R taken together, R and R taken together, R and R taken together, R and R taken together, R and R taken together, R and R taken together, and R and R taken together are alternatively bound to methylene-i dioxy (OCH -O-); with the prow'so that (a) at least one of R R, R, R and R and at least one of R R R R and R are hydrogen atoms,

(b) aplurality of trifluoromethyl groups are not bound to adjacent carbon atoms, (c) all of R R R and R of aryl and aralkyl groups are hydrogen atoms in a plurality of such groups attached to the same ring carbon, (d) each R and R of aryl and aralkyl groups are hydrogen atoms in a plurality of such groups attached to adjacent ring carbon atoms and (e) R and R of an aryl group and R and R of an aralkyl group bound to the same carbon atom as a cycloalkyl group are hydrogen atoms;

each of m and n is either 1 or 2; and

R is preferably primary amine (NHg); but is alternatively lower alkyleneimino, e.g., ethylenimino and piperidino.

Compounds within the scope of this invention include both geometric (cisand trans-) and stereoisomers.

For those compounds which have asymmetric carbon atoms both the individual stereoisomers and the racemic mixtures are within the scope of this invention. Compounds I are prepared by reacting a piperidine, RH, with sulfamide. An inert solvent medium (one which reacts neither with the reactants nor the subject compounds under the reaction conditions) may be used, but is not required. The reaction takes place by simple admixture of the stated react-ants at a temperature within the range of from 50 to 200 C. When a solvent medium is employed, the solvent is preferably a tertiary amino, such as a tri(lower)alkylarnine, e.g., triethylarnine; and an aryldi(1ower) alkylamine, e.g., phenyldimethylamine; but other solvents may also be employed. Examples of other suitable solvents are lower N-alkyl pyrrole, pyridine, lower alkyl pyridine, lower alkoxy pyridine, quinoline, lower alkyl quinoline, lower alkoxy quinoline, N-(lower)alkyl morpholine, N-aryl morpholine and N,N'di(lower) alkylpiperazine. [In the enumeration of .solvents, each lower alkyl and the alkyl of each lower alkoxy are, e.g., methyl,

" ethyl, propyl, isopropyl'and butyl; and each aryl (or ar-) is preferably phenyl] Although stirring is preferred, it is not necessary. The reaction proceeds to completion in from one to five hours. This reaction produces the preferred compounds.

According to this invention, these compounds are of the formula R-SO -NH H To prepare compounds of Formula I, other than primary aminesyH; an alternate two-step procedure is employed.

As a first step, a piperidine, RH, is admixed with sulfuryl chloride, SO C1 at a lower temperature, i.e., one within a range of from 50 to 0 C., in a solvent medium, whereby an intermediate of the formula R*-SO C-l III is prepared i As a second step intermediate III is reacted by contacting same with an amine, R'H. When R'H is ammonia, the re- .action is alternatively with liquid ammonia orby admixethane, 1,1,3-trichloropropane; cyclic monoethers, such as tetrahydrofuran; and cyclic diethers, such as dioxane. In addition to the inert solvent, as exemplified, one or more tertiary amines, such as enumerated for the reaction with sul-famide, may also be present as part of the reaction medium.

The reaction between RH and Compound III is actually a general reaction.

Exemplary compounds I are those set forth in the above table by the definition of R R R R R R R R and R. Although the table does not specifically designate those compounds which have asymmetric carbon atoms, geometric and stereoisometric forms (as well as r-acemic mixtures and racemates) are contemplated wherever applicable. All Compounds I are either prepared from known starting materials according to the preceding description or are prepared from starting materials which are readily prepared according to known pocedures from available compounds. In the table in addition to the standard elemental abbreviations the following definitions are employed:

Me-methyl iPr-isopropyl Et-ethyl Bubutyl Pr-propyl In addition to other pharmacological properties, the compounds of this invention are useful as anti-inflammatories. They are administered either orally or parenterally. The average daily dose may vary within the range of from 25 milligrams to 50 milligrams.

Oral dosage forms include tablets and capsules having standard fillers and other compound ingredients. Each of the pharmaceutically active compounds of this invention may be, e.g., incorporated for oral administration, in a tablet as the sole active ingredient. A typical tablet is constituted by from 1 to 3 percent binder, e.g., t-ragacanth; from 3 to 10 percent disintegrating agent, e.g., cornstarch; from 2 to 10 percent lubricant, e.g., talcum; from 0.25 to 1.0 percent lubricant, e.g., magnesium stearate; an average dosage of active ingredient; and q.s. 100 percent of filler, e.g., lactose; all percentages being by weight. Tablets are prepared according to standard tabletting techniques, which are well-known to the art, employing the necessary amounts of conventional granulating liquids, e.g., alcohol SD-30 and purified water. An exemplary tabletting formulation for the instant active compounds is:

Alcohol SD-30 Purified water q The following examples illustrate the invention, all temperatures being in degrees centigrade, the parts and percentages being by weight unless otherwise specified, and the relationship betweenparts by weight and parts by volume being the same as that between the kilogram and the liter.

EXAMPLE 1 4-benzyl-N-sulfamoylpiperidine HAL-O-SOz-NH:

Stir and reflux an admixture of 17.5 parts (0.1 mole) of 4-benzylpiperidine, 10.6 parts (0.11 mole) of sulfamide and 100 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room tempera- 6 him (20). During the cooling a crystalline material separates. Filter 01f the crystalline material and crystallize same from ethanol/water. There are thus obtained 7.0 parts of title compound, melting point (M.P.) 124 to 126.

Replacing the 4-benzylpiperidine with .an equivalent of either 4-phenethylpiperidine or 2-benzylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 2 2-methyl- -ethyl-N-sulfamoylpiperidine H2 CHa Stir and reflux an admixture of 12.7 parts (0.1 mole) of 2-methyl-5-ethylpiperidine, 11.5 parts (0.12 mole) of sulfamide and parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material precipitates. Filter off the crystalline material and crystallize same from ethanol/water. There are thus obtained 4.5 parts of title compound, M.P. 109.5 to 110.5".

Replacing the 5-ethyl-2-methylpiperidine with an equivalent of either 2,5-diethyl-3-methylpiperidine or 2,5-dimethyl-3-ethylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 3 4-n-propyl-N-sulfamoylpiperidine I Stir and reflux an admixture of 12.7 parts (0.1 mole) of 4-n-propylpiperidine; 10.6 parts (0.11 mole) of sulfamide and 100 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material precipitates. Filter ofr the crystalline material, and crystallize same from ethanol/water. There are thus obtained 10.1 parts of the title compound, M.P. 127 to 128.

Replacing the 4n-propylpiperidine with an equivalent of either 3-n-propylpiperidine or 4-i-propylpiperidine results in the preparation of the corresponding N-sulfarnoylpiperidine.

EXAMPLE 4 Z-n-propyl-N-sulfamoylpiperidine CHr-CHr-CH;

Stir and reflux an admixture of 12.7 parts (0.1 mole) of 2-n-propylpiperidine, 10.6 parts (0.11 mole) of sulfamide and 10 0 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material precipitates. Filter off the crystalline material and crystallize same from ethanol/water. There are thus obtained 10.0 parts of title compound, M.P. 76 to 76.5

Replacing the 2-n-propylpiperidine with an equivalent of either 2-i-propylpiperidine or 2,3-diisopropylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 5 4-methyl-N-sulfam oylpiperidine H N-SOr-NH:

Stir and reflux an admixture of 9.9 parts (0.1 mole) of 4-methylpiperidine, 10.6 parts (0.11 mole) of sulfamide and 100 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material precipitates. 'Filter off the crystalline material, and crystallize same from ethanol/water. There are thus obtained 14.3 parts of title compound, M.P. 126 to 126.5".

Replacing the 4-methylpiperidine With an equivalent of either 2-ethylpiperidine, 3-butylpiperidine or 2,3,4,6- tetramethylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 6 3-methyl-N-sulfamoylpiperidine Stir and reflux an admixture of 9.9 parts (0.1 mole) of 3-methylpi-peridine, 10.6 parts (0.11 mole) of sulfamide and 100 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material precipitates. Filter ofl the crystalline material, and crystallize same from ethanol/water. There are thus obtained 12.8 parts of title compound, M.P. 101.5 to 102.5".

Replacing the 3-methylpiperidine with an equivalent of either 2,3-dimethylpiperidine, 2,3,5-trimethylpiperidine or 2,3,6-trimethylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 7 3-methyl-dipiperidinosulfone Admix 0.2 mole of 3-methylpiperidine and 150 parts by volume of dry diethylether with 0.1 mole of sulfuryl chloride at and retain the reaction mixture at that temperature for about three hours. Thereafter admix the obtained product (without separation) with 0.2 mole of piperidine. Maintain the resultant at a temperature of at most Evaporate the solven to obtain the title compound.

EXAMPLE 8 N-sulfamoyl-4-phenylpiperidine Stir and reflux an admixture of 16.1 parts (0.1 mole) of 4-phenylpiperidine, 10.6 parts (0.11 mole) of sulfamide and 100 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material separates. Filter off the crystalline material and crystallize same from ethanol/water. There are thus obtained 13.1 parts of title compound, M.P. 179 to 181.5".

Replacing the 4-phenylpiperidine with an equivalent of either 3-phenylpiperidine or 2,5-diphenylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 9 N-sulfamoyl-4-benzhydrylpiperidine Stir and reflux an admixture of 12.5 parts (0.05 mole) of 4-benzhydrylpiperidine, 5.75 parts (0.06 mole) of sulfamide and 100 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material separates. Filter off the crystalline material and crystallize same from ethanol/ water. There are thus obtained 6.0 parts of title compound, M.P. 202 to 204.

Replacing the 4-benzhydrylpiperidine with an equivalent of either 4-(4,4-dimethylbenzhydryl)-piperidine or 4-(3,4-methylenedioxy 3',5' bis-trifluoromethylbenzhydryD-piperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE l0 N-sulfamoyl-3-ethy[piperidine Stir and reflux an admixture of 11.3 parts (0.1 mole) of 3-ethylpiperidine, 11.5 parts (0.12 mole) of sulfamide and parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material separates. Filter off the crystalline material and crystallize same from ethanol/water. There are thus obtained 12.5 parts of a mixture of cisand trans-isomers of the title compound, M.P. 146 to 148.

Replacing the 3-ethylpiperidine with an equivalent of either 4-ethylpiperidine or 3,6-diethylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 11 N-sulfamoyl-3,5-dimethylpiperidine' Stir and reflux an admixture of 11.3 parts (0.1 mole) of a mixture of cisand trans-3,S-dimethylpiperidine, 11.5 parts (0.12 mole) of sulfamide and 150 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material separates. Filter 011 the crystalline material and crystallize same from ethanol/water. There are thus obtained 12.5 parts of a mixture of cisand transisomers of the title compound, M.P. 146 to 148.

Replacing the mixture of cis and trans-3,5-dimethylpiperidine with an equivalent of either cis-3,5-dimethylpiperidine or trans-3,5-dirnethylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 12 N-sulfam0yl-3-methyl-4-ethylpiperidine mo-om-CN-sm-rrm Stir and reflux an admixture of 12.7 parts (0.1 mole) of a mixture of cisand trans-3-methyl-4 ethylpiperidine, 11.5 parts (0.12 mole) of sulfamide and 150 parts by volume of pyridine for about fifteen hours. 0001 the resulting product to room temperature. During the cooling a crystalline material separates. Filter off the crystalline material and crystallize same from ethanol/water. There are thus obtained 15.5 parts of a mixture of cisand transisomers of the title compound, M.P. 102 to 104.

Replacing the mixture of cisand trans-3-methyl-4- ethylpiperidine with an equivalent of either cis-3-methyl- 4-ethylpiperidine or trans-3-methyl-4-ethylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

9 EXAMPLE 13 N-sulfamyl-3,4-dimethylpiperidine Stir and reflux an admixture of 11.3 parts (0.1 mole) of cisand trans-3,4-dimethylpiperidine, 11.5 parts (0.12 mole) of sulfamide and 150 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material separates. Filter ofl the crystalline material and crystallize same from ethanol/water. There are thus obtained 12.5 parts of a mixture of cisand trans-isomers of the title compound, M.P. 89 to 90.

EXAMPLE 14 I N-sulfamoyl-2,5-dimethylpiperidine a Stir and reflux an admixture of 11.3 parts (0.1 mole) of cisand trans-2,5-dimethylpiperidine and 11.5 parts (0.12 mole) of sulfamide and 150 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature. During the cooling a crystalline material separates. Filter ofl the crystalline material and crystallize same from ethanol/water. There are thus obtained 8.7 parts of cisand trans-isomers of the title compound, M.P. 88 to 90.

EXAMPLE 15 N -salfamoy [-3 -methyl-3 -phenylpi perid ine Stir and reflux an admixture of 17.5 parts (0.1 mole) of 3-methyl-3-phenylpiperidine, 11.5 parts (0.12 mole) of sulfamide and 150 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature and filter off the thus-precipitated crystalline title compound.

Replacing the 3-methyl-3-phenylpiperidine with an equivalent of either 4-methyl-4-phenylpiperidine or 3,5- dimcthyl-3,S-diphenylpiperidine results in the preparation of the corresponding N-sulfamoylpiperidine.

EXAMPLE 16 N -sul fam0yl-3,3-dipheny[piperidine Stir and reflux an admixture of 23.7 parts (0.1 mole) of 3,3-diphenylpiperidine, 11.5 pars (0.12 mole) of sulfamide and 150 parts by volume of pyridine for about fifteen hours. Cool the resulting product to room temperature and filter ofl the thus-precipitated crystalline title compound.

RJR H H wherein each of R R R R R R, R and R is a member selected from the group consisting of a hydrogen atom, lower alkyl, a substituent of the formula cycloalkyl having from 5 to 7 carbon atoms, and, combined with the member bonded to the same carbon atom, polymethylene having from 5 to 6 carbon atoms; at most seven of R R R R R R R and R being hydrogen atoms and at least one of same being a substituent of said formula; at most three of said members other than hydrogen being bonded to adjacent ring carbon atoms; and no two of the polymethylenes being bonded to adjacent ring carbon atoms;

each of R R R R and R is a member selected from the group consisting of a hydrogen atom, a chlorine atom, a fluorine atom, a bromine atom, lower alkyl, lower alkoxy, trifluoromethyl, lower alkylthio, and, together with the member on an adjacent ring carbon atom, methylenedioxy; at least one of R R, R R and R being a hydrogen atom; no two trifluoromethyl groups being bound to adjacent carbon atoms; each of R and R being a hydrogen atom for two aryl groups bound to the same carbon atom of the piperidyl ring; each R being a hydrogen atom for two aryl groups bound to adjacent carbon atoms of the piperidyl ring; and each of R and R being a hydrogen atom for an aryl group bound to the same piperidyl ring carbon atom as a cycloalkyl group and each of n and p being one of the integers 1 and 2.

2. 4-benzyl-N-su1famoylpiperidine. 3. N-sulfamoyl-4-phenylpiperidine.

References Cited UNITED STATES PATENTS 8/ 1959 Wheeler et a1 260--293.47 3/1966 McManus et a1.

OTHER REFERENCES ALEX MAZEL, Primary Examiner.

R. J. GALLAGHER, Assistant Examiner. 

1. A COMPOUND HAVING THE STRUCTURE 